Measuring and testing – Simulating operating condition – Marine
Patent
1996-12-05
1998-03-24
Dombroske, George M.
Measuring and testing
Simulating operating condition
Marine
73 497, 340439, G01M 1500
Patent
active
057315140
ABSTRACT:
An abnormality detecting apparatus for use in a fuel-transpiration preventing mechanism can eliminate effects of changes in operating conditions and variations in equipment to increase the accuracy of abnormality detection. Fuel gas generated in a fuel tank and then absorbed by an absorbing material accommodated in a canister is discharged to an intake pipe by opening and closing a purge control valve. A change in pressure at a negative-pressure holding time after introduction of a negative pressure to the fuel-transpiration preventing mechanism and a change in pressure at an atmosphere-air introduction time after the negative-pressure holding time are calculated and the changes in pressure are used as a basis for determining the existence of an abnormality. As a result, effects of changes in operating conditions and effects of variations in purge control valves and canister closing valves can be eliminated, thus allowing the detection accuracy to be improved.
REFERENCES:
patent: 5317909 (1994-06-01), Yamada et al.
patent: 5408866 (1995-04-01), Kawamura et al.
patent: 5463998 (1995-11-01), Denz et al.
patent: 5467641 (1995-11-01), Williams et al.
patent: 5560346 (1996-10-01), Isobe et al.
Isomura Shigenori
Miwa Makoto
Nishio Teruo
Denso Corporation
Dombroske George M.
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